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FILE - In this July 19, 2011 file photo, pools of melted ice form atop Jakobshavn Glacier, near the edge of the vast Greenland ice sheet. Greenland's glaciers are hemorrhaging ice at an increasingly faster rate, but it's not the breakneck pace scientists once feared, a new study says.. (AP Photo/Brennan Linsley, File)

Global warming

Global warming is leading to such severe storms, droughts and heat waves that nations should prepare for an unprecedented onslaught of deadly and costly weather disasters, an international panel of climate scientists said in a report issued earlier this year.